// *****************************************************************
// Author:	Zhixiang Chen
// Class:	CSCI/CMPE 1170, Spring 2009
// Lab 3:	Math expressions, <cmath>, type conversion, named const
//			combined assignments
// Date:	Januray 12, 2009
// Comment: The code here is meant to be revised.
//
//-----------------------------------------------------------------
//
// Practice math expressions, functions in <cmath>, type conversion, 
// named consts, combined assignments
//
// Compile and run your program. When everything is fine,
// print your .cpp file and turn it to me or the TA
// *****************************************************************

#include < iostream >
#include < string >
#include < cmath> 
using namespace std; 

void showMenu(); 

int main( )
{
	//named const declaration
	const double PI=3.1415926; 

	//variable declarations
	int    u=3, v=7;				//vars to store two int values
	double x = 100.89, y=2.70,		//vars to store double values
		   z=0;	
	int	   intResult;				//var to store the integer result	
	double doubleResult;			//var to store double result
	double radius, area;			//vars to store area and radius
	int choice;						//var to store an int value for choice
	char option;					//var to store y/n option

	for ( ; ; )
	{
		showMenu();		//show menu
		cin>>choice;	//get the user's choice
		
		if (choice == 1) //see int to double
		{
			intResult= u/v; 
			cout<<"Without conversion, "<< u <<" / " << v <<" is " << intResult <<endl;  
			doubleResult = static_cast<double> (u) / static_cast<double>(v);
			cout<<"With conversion, " << u <<" / " << v <<" is " << doubleResult <<endl;
		}
	
		if (choice == 2) //see double to int
		{
			intResult = x/y; 
			cout<<"Without conversion, "<< x <<" / " << y <<" is " << intResult <<endl;  
			intResult = static_cast<int> (x) / static_cast<int>(y); 
			cout<<"With conversion, " << x <<" / " << y <<" is " << intResult<<endl;
		}
		
		if (choice == 3 ) //see char to int
		{
			cout << " The integer value of 'A' is => " << static_cast<int>('A')<<endl; 
		}
		
		if (choice == 4 ) //see int to char
		{
			cout << " The charactor of integer 65 is => " << static_cast<char>(65)<<endl; 
		}
		
		if (choice == 5) //overflow
		{
			x=999999999; 
			cout<<" x=9999999 becomes " <<x <<endl; 
		}

		if (choice == 6) //underflow
		{
			x=-9999999; 
			cout<<" x=-999999999 becomes " <<x <<endl; 
		}

		if (choice == 7)
		{
			cout<<"See what happends to x=y=z=25;"; 
			x=y=z=25;
			cout<<"x = " <<x <<", y = " <<y <<", z = " <<z<<endl; 
			cout<<"See what happends to x/=5;"; 
			cout<<"x = " <<x; 
			x/=5;
			cout<<".  After x/= 5; x becomes " <<x <<", z = " <<z<<endl; 
		}

		/*********************************************************************************
		//This part is for you. Ask the user to enter a double valued radius and compute 
		//the area of the circle with the given radius. 
		**********************************************************************************/
		if (choice == 8)
		{



		}

		cout<<"Do you want to play again (y/n)? "; 
		cin>>option; 
		
		if (option !='y')
		{
			cout<<"Bye bye!"<<endl<<endl; 		
			break; 
		}
	}


	//complete the work
	return 0;

}
void showMenu()
{
	cout<<"******************************************\n"
		<<"Enter 1 to see int to double conversion   \n"
		<<"Enter 2 to see double to int conversion   \n"
		<<"Enter 3 to see char to int conversion     \n"
		<<"Enter 4 to see int to char conversion     \n"
		<<"Enter 5 to see underflow					 \n"
		<<"Enter 6 to see over flow					 \n"
		<<"Enter 7 to see combined assignments       \n"
		<<"Enter 8 to calculate the area of a circle \n"
		<<"What is your choice  ==>  "; 

	return; 
}